EP1574847A3 - Circuit for measuring moisture capacitively and method for using the same - Google Patents

Circuit for measuring moisture capacitively and method for using the same Download PDF

Info

Publication number
EP1574847A3
EP1574847A3 EP05000783A EP05000783A EP1574847A3 EP 1574847 A3 EP1574847 A3 EP 1574847A3 EP 05000783 A EP05000783 A EP 05000783A EP 05000783 A EP05000783 A EP 05000783A EP 1574847 A3 EP1574847 A3 EP 1574847A3
Authority
EP
European Patent Office
Prior art keywords
unit
circuit
capacitively
same
capacitive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05000783A
Other languages
German (de)
French (fr)
Other versions
EP1574847B1 (en
EP1574847A2 (en
Inventor
Albin Haider
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
E&E Elektronik GmbH
Original Assignee
E&E Elektronik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by E&E Elektronik GmbH filed Critical E&E Elektronik GmbH
Publication of EP1574847A2 publication Critical patent/EP1574847A2/en
Publication of EP1574847A3 publication Critical patent/EP1574847A3/en
Application granted granted Critical
Publication of EP1574847B1 publication Critical patent/EP1574847B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The arrangement has a control unit to control switches to perform charging operations and discharging operations of a capacitive unit. The control unit performs parallel charging of a charge storage unit until the unit is charged to a defined reference value. A capacitance of the capacitive unit is determined from the charging operations, or of a time until the reference value is reached. An independent claim is also included for a method for operating a circuit arrangement for capacitive humidity measurement.
EP05000783A 2004-02-06 2005-01-15 Circuit for measuring moisture capacitively and method for using the same Active EP1574847B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004006020A DE102004006020A1 (en) 2004-02-06 2004-02-06 Circuit arrangement for capacitive humidity measurement and method for operating the same
DE102004006020 2004-02-06

Publications (3)

Publication Number Publication Date
EP1574847A2 EP1574847A2 (en) 2005-09-14
EP1574847A3 true EP1574847A3 (en) 2006-05-17
EP1574847B1 EP1574847B1 (en) 2008-06-18

Family

ID=34801702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05000783A Active EP1574847B1 (en) 2004-02-06 2005-01-15 Circuit for measuring moisture capacitively and method for using the same

Country Status (4)

Country Link
US (1) US7084644B2 (en)
EP (1) EP1574847B1 (en)
AT (1) ATE398772T1 (en)
DE (2) DE102004006020A1 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1677084A1 (en) * 2004-12-22 2006-07-05 Roxer Industries S.A. LIquid level sensor and method of estimation
DE102005012373B4 (en) * 2005-03-17 2007-11-15 Thermo Electron Led Gmbh Method for calibrating humidity sensors in air conditioners and air conditioner
WO2007048777A1 (en) * 2005-10-26 2007-05-03 Inergy Automotive Systems Research (Societe Anonyme) Capacitive gauge
FR2892509B1 (en) * 2005-10-26 2007-12-21 Inergy Automotive Systems Res CAPACITIVE GAUGE FOR FUEL TANK
DE102007042500B4 (en) * 2007-09-07 2022-05-05 Innovative Sensor Technology Ist Ag Device for determining and/or monitoring a process variable
DE102008041752A1 (en) 2008-09-02 2010-03-04 Robert Bosch Gmbh Method for determining a reception threshold, device for setting a reception threshold, ultrasound sonar
US8030949B2 (en) * 2008-10-31 2011-10-04 Testo Ag Measurement method for determining moisture content
DE102009027526A1 (en) 2009-07-08 2011-01-20 Robert Bosch Gmbh Circuit arrangement i.e. application-specific integrated circuit, for humidity measurement in housing of air mass flow meter in internal combustion engine of motor vehicle, has contact connected with another contact by switch
CN101738422B (en) * 2009-12-23 2012-09-05 北京宝力马传感技术有限公司 Humidity measuring device and method
GB201021033D0 (en) * 2010-12-13 2011-01-26 Verdirrigation Ltd An irrigation apparatus and a sensor therefor
DE102012207430A1 (en) * 2012-05-04 2013-11-07 Robert Bosch Gmbh Circuit arrangement for measuring a sensor element capacitance
DE102014210122A1 (en) * 2014-05-27 2015-12-03 Robert Bosch Gmbh An apparatus for determining a value of a property of a fluid to be measured, a method for operating a device for determining a value of a property of a fluid to be measured, and a method for producing a device for determining a value of a property of a fluid to be measured
ES2540154B2 (en) * 2014-11-07 2016-02-22 Seat, S.A. Device and method for measuring electrical quantities of analog sensors
WO2019001776A1 (en) 2017-06-28 2019-01-03 E+E Elektronik Ges.M.B.H Sensor device
CN113358713A (en) * 2020-03-04 2021-09-07 深圳绿米联创科技有限公司 Humidity detection unit, temperature and humidity detection device and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701899A1 (en) * 1996-01-21 1997-10-30 Ifm Electronic Gmbh Capacitance or capacitance variation detection circuit
US20030010119A1 (en) * 2001-07-16 2003-01-16 Inao Toyoda Capacitive Humidity Sensor
EP1341306A1 (en) * 2002-02-27 2003-09-03 E.G.O. ELEKTRO-GERÄTEBAU GmbH Circuit for a capacitive sensor element

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2020434B (en) * 1978-05-02 1982-09-29 Matsushita Electric Ind Co Ltd Apparatus for humidity detection
US4431962A (en) * 1982-03-11 1984-02-14 Honeywell, Inc. Capacitor monitoring by single resistor adjustment
FI84666C (en) 1990-02-07 1991-12-27 Vaisala Oy MAETKOPPLING FOER SMAO KAPASITANSER.
US5146412A (en) * 1990-05-17 1992-09-08 Jones Thad M Method and means for sensing a change in capacitance by a computer
US6466036B1 (en) * 1998-11-25 2002-10-15 Harald Philipp Charge transfer capacitance measurement circuit
DE10333154A1 (en) * 2003-07-22 2005-02-24 Vega Grieshaber Kg Method and circuit arrangement for evaluating a measuring capacity

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701899A1 (en) * 1996-01-21 1997-10-30 Ifm Electronic Gmbh Capacitance or capacitance variation detection circuit
US20030010119A1 (en) * 2001-07-16 2003-01-16 Inao Toyoda Capacitive Humidity Sensor
EP1341306A1 (en) * 2002-02-27 2003-09-03 E.G.O. ELEKTRO-GERÄTEBAU GmbH Circuit for a capacitive sensor element

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DIETZ P H ET AL: "Wireless liquid level sensing for restaurant applications", PROCEEDINGS OF IEEE SENSORS 2002. ORLANDO, FL, JUNE 12 - 14, 2002, IEEE INTERNATIONAL CONFERENCE ON SENSORS, NEW YORK, NY : IEEE, US, vol. VOL. 1 OF 2. CONF. 1, 12 June 2002 (2002-06-12), pages 715 - 720, XP010605190, ISBN: 0-7803-7454-1 *

Also Published As

Publication number Publication date
ATE398772T1 (en) 2008-07-15
EP1574847B1 (en) 2008-06-18
EP1574847A2 (en) 2005-09-14
US20050174129A1 (en) 2005-08-11
US7084644B2 (en) 2006-08-01
DE502005004431D1 (en) 2008-07-31
DE102004006020A1 (en) 2005-08-25

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